package com.example.emos.wx.db.dao;

import cn.hutool.core.date.DateField;
import cn.hutool.core.date.DateUtil;
import cn.hutool.json.JSONObject;
import com.example.emos.wx.db.pojo.MessageEntity;
import com.example.emos.wx.db.pojo.MessageRefEntity;
import com.mongodb.client.result.DeleteResult;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Sort;
import org.springframework.data.mongodb.core.MongoTemplate;
import org.springframework.data.mongodb.core.aggregation.Aggregation;
import org.springframework.data.mongodb.core.aggregation.AggregationResults;
import org.springframework.data.mongodb.core.query.Criteria;
import org.springframework.data.mongodb.core.query.Query;
import org.springframework.stereotype.Repository;

import java.util.Date;
import java.util.HashMap;
import java.util.List;

@Repository
public class MessageDao {
    @Autowired
    private MongoTemplate mongoTemplate;

    public String insert(MessageEntity entity){
        // 把北京时间转换成格林尼治时间
        Date sendTime=entity.getSendTime();
        sendTime=DateUtil.offset(sendTime, DateField.HOUR,8);
        entity.setSendTime(sendTime);
        entity=mongoTemplate.save(entity);
        return entity.get_id();
    }

    public List<HashMap> searchMessageByPage(int userId,long start,int length){
        JSONObject json=new JSONObject();
        json.set("$toString","$_id");
        Aggregation aggregation=Aggregation.newAggregation(
                Aggregation.addFields().addField("id").withValue(json).build(),
                Aggregation.lookup("message_ref","id","messageId","ref"),
                Aggregation.match(Criteria.where("ref.receiverId").is(userId)),
                Aggregation.sort(Sort.by(Sort.Direction.DESC,"sendTime")),
                Aggregation.skip(start),
                Aggregation.limit(length)
        );
        // 联合查询
        AggregationResults<HashMap> results=mongoTemplate.aggregate(aggregation,"message",HashMap.class);
        // 提取结果数据
        List<HashMap> list=results.getMappedResults();
        list.forEach(one->{
            List<MessageRefEntity> refList= (List<MessageRefEntity>) one.get("ref");
            MessageRefEntity entity=refList.get(0);
            boolean readFlag=entity.getReadFlag();
            String refId=entity.get_id();
            one.put("readFlag",readFlag);
            one.put("refId",refId);
            one.remove("ref");
            one.remove("_id");
            // 把格林尼治时间转换成北京时间
            Date sendTime= (Date) one.get("sendTime");
            sendTime=DateUtil.offset(sendTime,DateField.HOUR,-8);

            String today=DateUtil.today();
            // 如果今天的消息，只显示发送时间，不需要显示日期
            if(today.equals(DateUtil.date(sendTime).toDateStr())){
                one.put("sendTime",DateUtil.format(sendTime,"HH:mm"));
            }
            // 如果是以往的消息，只显示日期，不显示发送时间
            else{
                one.put("sendTime",DateUtil.format(sendTime,"yyyy/MM/dd"));
            }
        });
        return list;
    }

    public HashMap searchMessageById(String id){
        HashMap map=mongoTemplate.findById(id,HashMap.class,"message");
        Date sendTime= (Date) map.get("sendTime");
        // 把格林尼治时间转换成北京时间
        sendTime=DateUtil.offset(sendTime,DateField.HOUR,-8);
        map.replace("sendTime",DateUtil.format(sendTime,"yyyy-MM-dd HH:mm"));
        return map;
    }

    public long deleteUserMessage(int receiverId){
        Query query=new Query();
        query.addCriteria(Criteria.where("receiverId").is(receiverId));
        DeleteResult result=mongoTemplate.remove(query,"message");
        long rows=result.getDeletedCount();
        return rows;
    }
}
